[drcrippen]

Recently purchased a very nice '07 R1200s. However, I have noticed when I start off in gear there is what appears to be a rattle sound from the engine, maybe transmission. Sounds actually like a loose chain or something like it. Settles down once higher RPMs or constant speed is reached. Not noted at speeds as high as 90 mph. Only when running through first and second gear. Disappears when not loading the engine. And I have also noticed that the engine backfires when coming down hills with the throttle down.

It's hard to tell if this is pre-detonation because I don't really know what that sounds like. The only gas available to me is 93 octane. The engine otherwise runs fine. Seems like I read somewhere that this model has some extraneous sounds due to the hopped up engine.

Any ideas?

Thanks in advance.